STM

We mix different current.out, we used:
c1*current1 + c2*current2 +...
---------------------------------- = suma
c1 + c2 + ...
input: current(i) c(i) -> default c(i) = 1.0
for example:
//--------------------------
path/current_001.out 1
path/current_002.out 2
path/current_003.out 0.2
//-------------------------
the out put is:
(path/current_001.out)*1 + (path/current_002.out)*2 + (path/current_003.out)*0.2
name.out = ---------------------------------------------------------------------------------
1+2+0.2